What makes puzzle games addictive?
- by Bryan Denny
I'm currently developing a puzzle game for Android that is sort of along the lines of Alchemy.
I was wondering what makes games like Alchemy or Bejeweled so addicting?  How do I keep players interested in the game to want to play it over and over?  Is it the scores?  Level advancement?  The challenges?  What should I be doing to try and keep a player engaged with a puzzle game since they are often quite repetitive?